Changsha Drilling Machinery CO., LTD

Surface-Set Diamond Bit

The surface set diamond bit is produced from a single layer of natural diamond setting on the surface of bit crown with hard matrix.
Surface set diamond bit is mainly recommended for drilling soft to hard formations. Generally speaking, surface set diamond bit can provide satisfying penetration rate.

In order to confirm the surface-set bit quality, we have to confirm the following information:

Diamond sizes (spc – stones per carat)
As a general rule; the softer formation, the larger the diamonds used i.e. 20 to 25 spc. In hard formation, smaller diamonds 30 to 50 spc are typical

 

Diamond Size

Formation Drilled

10/20 SPC

Soft formation

20/30 SPC

Soft to medium formation

30/40 SPC

Medium formation

40/60 SPC

Medium to hard formation

60/80 SPC

Very hard formation


 

Diamond quality
The standard range of natural diamonds for surface set bits is chosen in a special allround grade with special quality. The quality includes selected and processed diamonds with a highly polished surface. These stones have a high impact resistance and may be considered as an universal type. Recommended for soft to medium hard formations.

Diamond Grade

Formation Drilled

A Grade

Soft formation

AA Grade

Sort to medium formation

AA Grade

Hard to very hard formation




Diamond size

range (SPC)

Actual number of

stone per carat

Diamond size

inch

mm

6~8

6~8

0.098

2.49

10

9~12

0.085

2.16

15

13~20

0.071

1.80

25

21~35

0.063

1.56

50

36~60

0.054

1.37

75

61~90

0.044

1.12

100

91~120

0.042

1.07


Profiles
Surface set drill bits are available in different profiles to obtain optimal drilling performance.
Standard profiles for surface set core bits:

 

Semi-Round Type (standardized by DCDMA)
The most commonly used of non-step core bits and good general-purpose bit, suitable for a wide variety of conditions depending on the diamond grade and size selected. It requires high bit loads and offers good strength especially in very hard broken formations.

 

Multi-Step (standardized by DCDMA)
Very popular bit for wireline drilling — good penetration and stability in all but very broken formations. Suitable for drilling hard and competent formations, hole deviation can be prevented.

 

Semi-round Face Discharges
Suitable for drilling sedimentary or metamorphic formations containing some more powder mineral. It can prevent excessive core washing out, so as to get high coring percentage.

 

Stepped Face Discharges
The face discharge crown features extended ports to minimize sample erosion,thereby increasing core recovery in delicate formations

 
 
 
 
 
 

 

Product Show
Surface Set Core Bit - AQ
Surface Set Core Bit - AQ
Surface Set Core Bit - NQ (7 Step)
Surface Set Core Bit - NQ (7 Step)
Surface Set Core Bit - NQ (5 Step)
Surface Set Core Bit - NQ (5 Step)
Surface Set Core Bit - NQ (Semi-Round)
Surface Set Core Bit - NQ (Semi-Round)
Surface-Set Non Core Bit
Surface-Set Non Core Bit
T2-66 Surface-Set Diamond Bit
T2-66 Surface-Set Diamond Bit
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